Codebook for Egel and Obermeier (2022), "A Friend Like Me: The Effect of IO Membership on State Preferences"


VARIABLES FOR A_friend_like_me_eastern

ccode1 = Correlates of War (COW) country code for State A

ccode2 = Correlates of War (COW) country code for State B

year = year

other_joint_IO_memberships = total number of membership in intergovernmental organizations shared by dyad members, excluding the 19 organizations that form the treatment variable

dyad = unique identifier for each dyad

relative_economic_size = log of the larger state's GDP relative to that of its smaller dyad partner

politydifference = absolute difference between dyad partners' Polity5 scores

relative_economic_development = log of richer state's GDP per capita relative to that of its poorer dyad partner

post = pre-2004 (0) or post-2004 (1)

idealsimilarity = absolute distance between dyad partners' ideal point estimates multiplied by -1

idealsimilarity_eu_15 = 1990-2004 average of non-EU dyad partner's ideal point similarity score with all EU-15 members

trade_eu_15 = 1990-2004 average of total trade flows between non-EU dyad partner and all EU-15 members, in US millions of current dollars

geographic_distance = distance in miles between the two national capitals in the dyad

year90 - year14 = dummy variables for the years 1990 to 2014

treatment = captures whether non-EU state is in one of the 19 intergovernmental organizations in which the EU as a whole holds membership (1) or not (0)

treatment_levels = captures how many of the 19 intergovernmental organizations in which the EU as a whole holds membership the non-EU state also holds membership in: none (0), one (1), 2-3 (2), 4 (3), 5-12 (4)


VARIABLES FOR A_friend_like_me_eastern_EU15 

ccode1 = Correlates of War (COW) country code for State A

ccode2 = Correlates of War (COW) country code for State B

year = year

dyad = unique identifier for each dyad

joint_IO_memberships = total number of membership in intergovernmental organizations shared by dyad members, excluding the 19 organizations that form the treatment variable

relative_economic_development = log of richer state's GDP per capita relative to that of its poorer dyad partner

politydifference = absolute difference between dyad partners' Polity5 scores

relative_economic_size = log of the larger state's GDP relative to that of its smaller dyad partner

geographic_distance = distance in miles between the two national capitals in the dyad

idealsimilarity = absolute distance between dyad partners' ideal point estimates multiplied by -1

treatment = captures whether non-EU state is in one of the 19 intergovernmental organizations in which the EU as a whole holds membership (1) or not (0)

post = pre-2004 (0) or post-2004 (1)

new_EU_member = captures whether the EU member state is EU-15 (0) or joined the EU in 2004 (1)


VARIABLES FOR A_friend_like_me_northern

ccode1 = Correlates of War (COW) country code for State A

ccode2 = Correlates of War (COW) country code for State B

year = year

dyad = unique identifier for each dyad

idealsimilarity = absolute distance between dyad partners' ideal point estimates multiplied by -1

treatment = captures whether non-EU state is in one of the 5 intergovernmental organizations in which the EU as a whole held membership in 1995 (1) or not (0)

post = pre-1995 (0) or post-1995 (1)